body {
    padding: 20px;
    margin: 0 auto;
    background-color: #E2E2E2;
    max-width: 1024px;
    color: #595B66;
    font-family: 'Microsoft Yahei', sans-serif;
}
h1,h2,h3,h4 {
    color: #797979;
// border-bottom: solid 1px #797979;
    padding: 5px 0;
}
h1, h2 {
    border-bottom: solid 2px #797979;
}
p {
    font-size: 15px;
    background: #797979;
    padding: 10px;
    border-radius: 5px;
    color: white;
    line-height: 2;
}
a {
    color: #FFD200;
}
.box {
    background-color: white;
    margin: 0 0 55px;
    display: flex;

}
.box-tall {
    height: 800px;
}
.box-item {
    width: 200px;
    height: 200px;
    line-height: 200px;
    vertical-align: middle;
    margin: 5px;
    background-color: #ffd200;
    font-size: 100px;
    color: white;
    text-align: center;
}
.item-tall {
    height: 400px;
    line-height: 400px;
}


.box-1 {
    flex-direction: row;
}

.box-2 {
    flex-direction: row;
    flex-wrap: nowrap;
}

.box-3 {
    flex-direction: row;
    flex-wrap: wrap;
}

.box-4 {
    flex-direction: row;
    flex-wrap: wrap-reverse;
}

.box-5 {
    flex-flow: row nowrap;
}

.box-6 {
    justify-content: flex-start;
}
.box-7 {
    justify-content: flex-end;
}
.box-8 {
    justify-content: center;
}
.box-9 {
    justify-content: space-between;
}
.box-10 {
    justify-content: space-around;
}

.box-11 {
    align-items: flex-start;
}
.box-12 {
    align-items: flex-end;
}
.box-13 {
    align-items: center;
}
.box-14 {
    align-items: baseline;
}
.box-14 .box-item{
    font-size: 88px;
    line-height: initial;
    text-decoration: underline;
}
.box-14 .item-tall{
    font-size: 122px;
    line-height: initial;
}
.box-15 {
    align-items: stretch;
}
.box-15 .box-item {
    height: auto;
}

.box-16 {
    flex-wrap: wrap;
    align-content: flex-start;
}
.box-17 {
    flex-wrap: wrap;
    align-content: flex-end;
}
.box-18 {
    flex-wrap: wrap;
    align-content: center;
}
.box-19 {
    flex-wrap: wrap;
    align-content: space-between
}
.box-20 {
    flex-wrap: wrap;
    align-content: space-around;
}
.box-21 {
    flex-wrap: wrap;
    align-content: stretch;
}
.box-21 .box-item {
    height: auto;
}

.box-22 .order {
    order: -1;
}
.box-item div{
    font-size: 14px;
    position: relative;
    top: -150px;
}

.box-23 .box-item{
    flex-grow: 1;
    width: auto;
}
.box-23	.grow-2 {
    flex-grow: 2;
}

.box-24 .box-item {
    width: 400px;
}
.box-24 .shrink{
    flex-shrink: 0;
}

.box-25 .box-item {
    flex-basis: 200px;
    width: 400px; // width 将失去作用
}

.box-26 {
    height: 400px;
}
.box-26 .box-item {
    align-self: flex-start;
}
.box-26 .end {
    align-self: flex-end;
}